Volumetric compressor



, Sept. 28, 1943.

L. AUQUBERT 'VOLUMETRIC COMPRS S OR Filed "April 1, 1939 Inyenvr.Ludovic distinct spaces, one of Patented Sept. 28, 1943 ,y voriuivmrmocoMraasSoR l f Application April 1, 1939, 'sei-inist. 265,573'vInLuxemburg April 16,1938

)3 claims; (c1. 23a-2in A 'lherpresent inventiontrelatcs. tovolumetriccompressors and .it is more especially, although not-,.exc1usiv.e1 y,Concerned. -withl :devices of .this vhind for useinconnection:withaircrafts.

l'The object O. theY presentr invention is to provide a 1device of thiskindgwhieh is better adapted to 4niieet; the requirementssoi practicethan lthose used for the same purposefup lto the .present time, .and.inj particular capable of, lworking better at lrliehsp,cede-` ,i-

Accordingtogan essential ieatureof the present Vinventifon;.theseengi-nes are varranged in such mannerA that :their delivery is divi-dedinto two different steps and feeds duid to twol differ-ent spaces,one ofthephases in question corresponding to a circulation through thecompressor of a fluid capable of evacuating at least a portion of thecalories developed by the operation of the apparatus.

Other features of the present invention will result from the followingdetailed description of a specific embodiment thereof.

Preferred embodiment of the vpresent invention will be hereinafterdescribed with reference to the accompanying drawing, given merely byway of example, and in which:

Fig. 1 is a diagrammatic `sectional view of a compressor including apiston and an imperatively controlled inlet valve made according to thepresent invention;

Fig. 2 shows, on an' enlarged scale the outline -or prole of the camwhich controls the inlet valve of this compressor.

In the following description, it will be supposed, by way of example,that it is desired to provide a volumetric compressor, especially capa..ble of being used in compression operations for aircraits.

This compressor is made, as a whole, in any suitable manner, forinstance as illustrated by Fig. 1, that is to say it includes a piston Idriven through a connecting rod 2, by the rotation of a crankshaft 3 andmoving in a cylinder 4.

This compressor is arranged in such manner that its discharge is dividedinto two different phases corresponding to the feed of fluid to two thephases in question corresponding to a circulation, through thecompressor, of a fluid capable of evacuating at least a portion of thecalories given off by the operation of the apparatus.

According to the preferred embodiment of the invention, one of theoutflows of fluid takes place during at least one complete compressionand delivery period and the other fluid outiiow takes place. during. at,'least.chesuch-@Orientene cd,

dierent from the preceding one. f

l' I may, according to,4 this; hrcfcrrcdfcrhhcdiment. provide the.compressor Wiihasucbicn: vali/Ic controlled in suchmanner that vit;remains Open forY X ,discharge strokes and remains closeddar.-

.me Y such, stroxesin which .case the fluidrsuchcd insuring theSuction-Strokes .preceding cachaof said X, strokes is merely-discharged.to .theorie side of the cylinder towardthespace from which it; camedur-ing theX strokesfhiquestiom y According lto the preferred, formojf`the inventiomthe- Same fluid ,will .be s Clelive n ing the twodifferent vph `,seafof theoperation .of

thcccmprcsscrf In this.. caselli willtcsumcirt to perform thedischargetoward one of the spaces at apressure lower than the dischargeto the other space, and the cooling effect will VVbe obtained.

In the following description, it will be assumed that v,the fiuid inquestion consists of'atmcspheric air, in whichv case,vthefiirst space isthe atmosphere and the second is a compressed air reservoir.

A particularly advantageous embodiment of such an arrangement accordingto the invention is shown by Fig. 1.

In this embodiment, the compressor is tted.

with a positively controlled i'nlet orice, for in` stance by means of avalve 5, and with a discharge orice, with an automatic valve '6 with areturn spring, leading toward a reservoir l. for the compressed air.

In order to actuate valve 5, I provide a cam 8 or the like, turning at aspeed which is one half of that of crank-shaft 3, said cam being suchthat, for a full cycle. of operation, valve 5 remains open, then duringa full cycle, following that above mentioned, it closes during theupward stroke of piston l, so as to permit delivery toward reservoir 1,this operation being then repeated as long as the compressor is inoperation. v

Thus, after a discharge cycle during which the calories have beenproduced, there is a scavenging cycle during which at least a portion ofthese y calories is evacuated.

Of course, I might interpose X scavenging" ing the scavenging cycles, itis advantageous :to

to give the cam a A provide for a short closing of said valve, at thetime when the piston is close to the top of its stroke, and for thispurpose, for instance, I provide cam 8 with a recess 9 at the suitablespace, as shown by the diagrammatical view of Fig. 2.

Then, in all cases, I obtain a compressor the internal cooling of whichcan be regulated at will by the circulation of the iuid dis-chargedtoward the rst mentioned space.

s a matter of fact, this iiuid may be used for the external cooling ofthe compressor, by being obtained according to the present inventionpermits of considerably increasing the speed of revolution of the shaftsof compressors, and of Working them without damage at the high speedsthat are generally employed in the case of accessories used inconnection with aircraft engines.

In a general manner, while I have, in the above description, disclosedwhat I deem to be practical and efcient embodiments of the presentinvention, it should be well understood that I do not Wish to be limitedthereto as there might be changes made in the arrangement, disposition,and form of the parts without departing from the principle of thepresent invention as comprehended within the scope of the appendedclaims.

What I claim is:

1. A 'compressor having a crankshaft and a piston connected to saidcrankshaft and including a suction orifice, a rst valve `for controllingsaid suction orice, a delivery orifice, a compressed air reservoirconnected to said delivery orifice, an automatically operating Valvehaving a return spring to control the delivery oriiice, a cam foroperating said rst valve, means for driving said cam at half the speedof the crankshaft of the compressor, whereby during at least a portionof the compression stroke of one complete cycle said rst valve remainsopen and during the following complete cycle said rst valve closesduring the compression stroke of the piston, thereby permitting thedeliveryof air to the compressed air reservoir. N .i 2`

2. A compressor according to claim 1, wherein the said cam permits saidfirst valve to close for a short period during theA scavenging cyclesand at the time when the piston is inthe vicinity of its upper deadpoint, so as to prevent the piston from striking thisvvalve. f i

3. A. compressor according to claim 1, in `which the inlet conduit is soarranged that the f discharge of the air during the compression strokeof the cycle when the first valve' remainsiopen is directed towards thehead of Ithe compressor for cooling the same. i f

LUDOVIC AUDUBERT.

